Ignition-timer.



E. B. JACOBSON.

mmnow TIMER. APPLICATION FILED OCT. 29, I915. 1,1 88,451 Patented June 27, 1916.

new

WITNESSES: l/VVEN'I'OI? 2 5 2 I [aw/W0 didacoasoq EDWARD B. JACUESO'N, 0F- PITTSFIELD, MASSACHUSETTS.

IGNITION-TIMER.

Specification of Letters Yatent.

Patented June 27, 1916.

Application filed October 29. 1915, Serial No. 58,687.

ing portion and adapted to successively engage said contacts at predetermined intervals for closing and breaking corresponding electric circuits.

The invention particularly concerns the rotary portion of the de ice, and has for its essential object to simplify the construction and improve the durability of this portion.

Among the advantages obtained from the means provided to attain the foregoing object are facility of assembly and disassem- I bly, n substantially uniform degree of pressure exerted by the contact-roll at all points within the are of its swing, and rigidity of the contact arm assembly-insuring even ongagement of the contact-roll.

To these ends the invention consists. in the construction, combinetioirend arrangement of parts, hereinafter more particularly described and pointed out in the claims.

1n the accompanying drawings, which illustrate the preferred form of embodiment of my invention, Figure- 1 is a vertical longitudinal s ction of the assembled device operatively mounted upon a shaft; Fig. 2, n face view of the same, the shell or housing being shown in section. and a portion of the insulation ring :rboutone of the sectors being cut away; Fig. :1 side elevation of the housing clamp mounted upon its support and the engaged housing with its rear por-' tion cut away; F i g. 4, a side elevation of the carrier; Fig. 5, a front elevation of the same; Fig. c, a longitudinal vertical section of the rotary portion operatively mounted; Fig. '4', a ver ical cross-section of the carrier assembly on ih line l e-[ i of Fig. (3; Fig. 8. a front elevation. of the (arricr,assen'ibly,

lfiigs. 7 and 1% showing in dotted lines the limits of swing of the contact errn; Fig. S), n

.verticzrl section of'the front end of the carrier as shown in Fig. (3 and rotated 90 Fig. 10, at bottom view of it section of the carrier assembly on the line B-B of Fl". 8;

Fig. 11, a perspective view of one of the plates of the contact arm; and Fig. 12,

a side view of the contact-roll and mounting, the latter being cut away rearwardly.

The mechanism. herein illustrated is designed for use in connection with a fourcylinder motor having :r gem-driven comshaft operated by the main engine shaft, but it to be understood, however, that my invention is applicable for use with motors having any number of explosive cylinders and may be otherwise mounted and driven.

As shown, a housing or casing 1 in the form of a hollow conical shell, is mounted on the front end of the engine housing 2 and arranged, to inclose a shaft 3 geared to the main engine shaft (not shown) and projecting through a suitable opening in the engine housing. 7

The rear end of the casing 1 is open and seated in a circular recess -1 provided in the face of the engine housing 2, the wall of said recess being adapted to prevent downward displacement of the casing. Forward displacement of the casing 1 is prevented by a spring clamp 5 removably secured at its rear end to a stud or bolt 6 fixed to the Wall of the engine housing 2, and engaging at its opposite end the nose of the casing 1, which has a central depression to receive a boss 7 provided on the clamp 5. Axial movement of the casing 1 for regulating the time of ignition is controlled by a lateral arm 8 eze teriorly nioi'mted on the casing and provided with a bushing 9 to receive a control-rod (not shown).

Within the casing 1 is an insulation ring 10 provided at regular intervals with exposed arcuatecontacts or sectors 11, 11, etc, embedded on its inner face and provided with stems 12, 12, etc, which extend through the ring and casing and project beyond the some to form terminals for connection with the primary circuits of separate inductioncoils. Said stems 12, 12, are insulated from the casing 1 by fiber bushings 13, 13, etc., and are threaded at their outer ends to carry clamping nuts 1-1, 11, and a washer 15.

Mounted. to rotate ith the shaft 3 within the casing 1. is a metallic carrier 16 in the form of a sleeve normally secured against rotation on the shaft by means of a remov-- able pin 17 projecting through a transverse opening through the shaft and extending into slots 18, 18, provided at opposite points in the outer end of the carrier 16. The pin 17 is secured against endwise displacement by means of a cup-washer 19 fitted over the slotted end of the carrier and covering the ends of the pin, the reduced end of the shaft projectingj through said washer being threaded to receive nuts 20, 21, which are employed in conjunction with a fiat outer washer 22 engaging the cup-washer 19, to hold the latter in lace.

The carrier 16 1s provided laterally with parallel wings 23, 23, which are apertured at their outer ends to receive a pin 24 for the pivotal support of a contact. arm consisting of plates 25, 26, secured together .in fixed spaced relation'by a shouldered tie-pin 27 extending through the plates and suitably burred thereon at its outer ends. The plates 25, 26, are connected at their outer ends by a separate pin 28 on which is m0unted to rotate a contact-roll 29 arranged to travel over the inner face of the insulation ring 10 a d to convey the current from the sectors, 11, 11, etc., to ground' The pin 28 on which the roll 29 is journaled is formed on one end with a flanged head 30 which overlaps the outer face of the plate 25 and is provided on its margin,

with a radial notch 31 into which a key 32, raised out of the body of the plate 25, takes .to prevent rotation of the pin 28- and the consequent wear of the plates 25, 26, and an uneven contact of the roll 29 with the sectors 11, 11, etc. Said roll 29 is arranged to engage the insulation ring 10 with a prede termined yielding pressure which insures a firm contact with the sectors, 11, 11, etc., by means of a coil-s ring 33 carried on the in 24, one end 84 o the spring being exten ed downward to bear downward upon the body of the carrier 16, and the opposite end 35 of the spring being extended forward to bear upward against the underside of the tie-pin 27', the extremity of said end 35 of the spring being curved to conform to the surface of the pin 27.

The pressure exerted by the roll 29 through the action of the spring 33 is substantially uniform at all points within the arc of its swing which is limited by the in sulation ring 10 when the parts are operatively assembled and, when the carrier is removed from its mounting,- by a stop 36 in the form of an arcuate shoulder provided preferably at the base of the outer carrier wing 23 and in position for engagement by the foot 37 provided on the inner margin of the plate 25 at its rear end as the contact arm swings outward under the impulse of the spring 33. The advantage of the function of the stop 36 in limiting the swing ofthe contact arm outward applies more particularly 'to the assembling of the device, especially when the working space about the engine head is ,verlimited and the unskilled mechanic hasid fiiculty in placing the casing over the rotary p'ortion after removal for cleaning or repairs.

The substantially uniform pressure exerted by the spring 33 upon the contact arm at all points of its swing obviates any neces sity for further adjustment after initial whence the current is conducted to induc tion-coils and thence successively to" the terminals provided on the housing portion of my device. The circuit is completed through. the rotary portion of the device which conveys the current to ground when the contact-roll 29 contacts with the proper sector 11 on the insulation ring 10, the correct position of the contact-roll 29 with respect to the several sectors 11, 11, etc., being prearranged'in assemblin the parts. Advancing or retarding the time of ignition in the engine c linders is accomplished .by slightly rotating the shell or housing -1 by the aid of the arm 8. It will be understood that the parts of my device forming a path for the current are constructed of suitable conductive material.

I claim 1. In an ignition timer, the combination with a casing and'contact elements mounted in the casing, of a rotary portion mounted 'to move in the casing and including a. carrier, a contact arm pivotally secured to the carrier for engaging the contact elements 1 and arranged to be swung toward and away from the carrier, and auxiliary means for limiting the swingof the arm away from the carrier.

2. In an ignition timer, the combination with a casing and contact elements mounted in the casing, of a rotary portioii'mounted to move in the casing and including a carrier, an arm pivotally secured to the carrier and arranged to be swung outward for engagean arm pivotally secured to the carrier and having a aw, a transverse pm earned on the arm through said ]awand having a lateral recess at one end, a roller journaled on the pin and arranged to travel in the plane of the contact elements tor engagement therewith, means for actuating saidarm out ward, and separate means for preventing the pin on said arm from revolting with the roller and including a fixed member provided laterally on the jaw and arranged to take into said recess in the pin.

4. In an ignition timer, the combination away from the contact elements, a contact- Disclaimer in Letters iP atent N 51 ,188,45"l= roll carried on the outer end of said arm arranged for normal engagement with the contact elements, and a coil spring carried on said transverse member and arranged to impel said arm away from the carrier.

In an ignition timer, the con'ibinalion Manufacturing Company. wEnters its disclaimerwith a casing and contact elements mounted in the casing, of a rotary portion mounted to move in the casing and including a carrier having parallel lateral extensions spaced apart, a. transverse pin carried by said extensions at theiirouter ends, an arm arranged to be swung toward and away from the contact elements and including oppositely arranged plates journaled onsaid pin,

a transverse bar for securing said plates together centrally, a roller revolubly mounted between the outer ends of said plates and arranged to travel in a plane with the contact elements for engagement therewith, and

a coil spring mounted on said transverse pin and operating to impel said. arm toward the contact elements, one end of said spring being arranged to bear against the carrier and, the other end of the spring being arranged to bear against said plate-securing bar. Y

In testimony whereof I hereunto aflix my signature in presence of two witnesses.

EDWARD n. JACOBSON. Witnesses JOHN BARKER, J N0. J. iirrrnnsnr.

DISCLAIMER.

1,18,451.-- EdwardB. Jacobson, Pittsfield, Mass. IGNITIoN-TiMEns. Patent dated, June 27, 1916. Disclaimer filed February 20, 1919, by the assignee, J. ct: B.

As to claim 1, of every contact arm in the combination of elements contained in said claim, except a contacta rm com rising aframe formed of two metal side plates lying substantially parallel and rigid y spaced apart and embracing a contact device supported between said side plates toward one end thereof;

As to claim 2, of every arm in the combination of elements contained in said clai1n, except an arm comprising a frame formed of two metal side plates spaced apart by a rigid connection and at least one shouldered pin, and being pivotall secured on opposite sides of that portion of the carrier to whichthe arm is pivoted: said plates carrying a contact device between them.

As to claim 4, of every arm in the combination of elements contained-in said claim, except an arm comprising a rigid frame having two metal side plates spaced apart and located outside of the lateral extensions from the carrier and connected by at least two shouldered tie pins passing through holes in said plates and burred over on the outside thereof, one of said pins carrying the contact roll. 

